JP2000161294A - Forcible air cooling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forcible air cooling machine capable of automatically changing the diversion of cooling air to its great extent in response to change in environmental temperature without making the machine larger in size with its structure simplified. SOLUTION: This machine is equipped with a first impeller 1 capable of being rotated by a rotating means, and of being deformed when environmental temperature is in excess of a specified value, and with a second impeller 2 capable of being engaged with the first impeller 1 as the first impeller 1 is deformed, and of being rotated by the rotating means. The first impeller 1 can be made out of a shape memory alloy, the first and second impellers 1 and 2 are the impellers of an axial flow fan, the second impeller 2 is located at the outer side of the first impeller 1, and the rotation of the first impeller 1 togehter with the second impeller 2 enables the external form of the axial flow fan to be made larger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forced air cooler, and more particularly, to a forced air cooler used in a food cooler or the like and capable of automatically adjusting a flow rate of a cooling gas.

[0002]

2. Description of the Related Art Conventionally, a forced air cooler used for cooling various devices such as a food cooling device generally blows a certain amount of cooling gas.

However, when the environmental temperature changes, it is preferable to change the flow rate of the cooling gas in accordance with the change. For example, in the technology described in Japanese Patent Application Laid-Open No. H10-190268, a technique for forced air cooling is used. A fan is provided, for example, with a boundary between an upper limit temperature and a lower limit temperature of a temperature range in which the device can be operated, a radiating heat sink of the heat deforming unit is deformed, a cooling fluid path is changed, and a cooling Fluid flow rate is changing.

However, in the technology described in this publication, a fan for forced air cooling and a heat sink for heat radiation are provided, so a space for these is required, and the forced air cooler is increased in size. There was a problem of doing.

On the other hand, JP-A-6-33895 discloses that
As a cooling fan that does not need to use a temperature control device and a variable speed motor, and a cool air circulation type cooling device using this fan, when the environmental temperature changes, the pitch angle of the blade using a shape memory alloy as a material when the environmental temperature changes An apparatus capable of changing the amount of generated cooling gas is disclosed.

However, according to this device, the pitch angle of the blades of the fan only changes in accordance with the change in the environmental temperature. Therefore, it is difficult to greatly change the flow rate of the cooling gas. Was.

Therefore, the present invention has been made in view of the above-mentioned problems in the conventional forced air cooler, and has a simple structure without causing an increase in the size of the apparatus, and has a simple structure for cooling in accordance with a change in environmental temperature. It is an object of the present invention to provide a forced air cooler capable of automatically changing the diversion of gas.

[0008]

In order to achieve the above object, an invention according to claim 1 is a forced air cooler, which is rotated by a rotating means and deformed when an environmental temperature exceeds a predetermined temperature. It is characterized by having one impeller and a second impeller that is engaged with the first impeller by deformation of the first impeller and is rotated by the rotating means together with the first impeller.

According to the first aspect of the present invention, when the environmental temperature is lower than the predetermined temperature, only the first impeller rotates, and when the environmental temperature becomes higher than the predetermined temperature, the first impeller rotates. At the same time, the second impeller also rotates, so that the flow rate of the cooling gas can be automatically changed according to the change in the environmental temperature.

At this time, since the first impeller is deformed in accordance with the change in the environmental temperature and the second impeller is also rotated, the rotation speeds of the first and second impellers are changed by the variable speed rotating means. It is not necessary to change it or to use a heat-radiating heat sink as in the related art, and the flow rate of the cooling air can be changed with a simple configuration.

In addition, unlike the prior art, instead of simply changing the pitch angle of the blades, another another impeller is rotated, so that the flow rate of the cooling air can be greatly changed. The effect increases.

Further, in the invention according to claim 2, the first impeller is formed of a shape memory alloy, and when the environmental temperature becomes higher than the transformation temperature of the shape memory alloy, the first impeller deforms and the first impeller deforms. It is characterized by engaging with the second impeller.

Thus, the forced air cooler can be easily configured by adjusting the predetermined environmental temperature for changing the flow rate of the cooling air to the transformation temperature of the shape memory alloy.

Further, the invention according to claim 3 is characterized in that the first
The impeller and the second impeller are axial fan impellers,
The second impeller is located outside the first impeller, and the outer shape of the axial fan increases when the first impeller rotates together with the second impeller.

Thus, the first impeller and the second impeller rotate about the same center of rotation, and the external dimensions of the axial fan are changed, thereby changing the flow rate of the cooling air. There is no increase in size.

[0016]

Next, a specific example of an embodiment of a forced air cooler according to the present invention will be described with reference to the drawings.

FIG. 1 to FIG. 3 are views showing an entire embodiment of a forced air cooler according to the present invention. The forced air cooler is rotated by a motor 3 and has an environmental temperature equal to or higher than a predetermined temperature. , And a second impeller 2 that is engaged with the first impeller 1 by deformation of the first impeller 1 and is rotated by the motor 3 together with the first impeller 1.
The first impeller 1 and the second impeller 2 constitute an axial fan.

As shown in FIG. 2, the motor 3 is fixed to a frame 5, and an engagement hole 1d (FIG. 4) of the first impeller 1 is fixed to an output shaft of the motor 3, so that the motor 3 rotates. Accordingly, the first impeller 1 is also configured to rotate.

As shown in FIG. 4, the first impeller 1 has four blades 1a connected by a column 1b and a column 1b.
1d is inserted and fixed to the output shaft of the motor 3. This blade 1a is formed of a shape memory alloy,
When the environmental temperature of the edge 1c of the blade 1a exceeds a predetermined temperature and exceeds the transformation temperature of the shape memory alloy, the edge 1c of FIG.
It is deformed like a hatched portion in (c) and (d).

As shown in FIG. 5, the second impeller 2 has four blades 2a connected by a support 2b and a support 2b.
Is inserted into the support shaft 4a of the frame 4, and the second impeller 2 is rotatably supported. And
When the environmental temperature becomes equal to or higher than the predetermined temperature and the edge 1c of the first impeller 1 is deformed, the column 2b is engaged with the edge 1c, and the second impeller 2 can rotate together with the first impeller 1. Become.

The frame 4 and the frame 5 are integrally formed, and hold the first impeller 1, the second impeller 2, and the motor 3 by both.

As shown in FIG. 3, this forced air cooler includes:
Further, a cable 6 and a connector 7 are provided for supplying power to the motor 3.

Next, the operation of the forced air cooler having the above configuration will be described in detail.

First, when the ambient temperature is equal to or lower than a predetermined temperature, the first impeller 1 is rotated by the motor 3 as shown in FIG. Flows.

When the environmental temperature becomes equal to or higher than the predetermined temperature and becomes equal to or higher than the transformation temperature of the shape memory alloy forming the first impeller 1, as shown in FIG. It deforms, and the edge 1c engages with the support 2b as shown in FIG. 2 (b). Thereby, the rotational force of the motor 3 is also transmitted to the second impeller 2 via the first impeller 1,
The impeller 2 rotates about the support shaft 4 a of the frame 4. Therefore, a large amount of cooling air flows from the arrow X direction to the arrow Y direction, and it is possible to cope with an increase in environmental temperature.

In the state shown in FIG. 2 (b), when the environmental temperature falls below a predetermined temperature, the first impeller 1
Is returned to the state shown in FIGS. 4A and 4B, and FIG.
As shown in (a), since the engagement between the edge portion 1c and the support portion 2b is released, only the first impeller 1 rotates, and the flow rate of the cooling air decreases.

In the above embodiment, the first impeller 1
Is formed of a shape memory alloy, and is deformed and engaged with the second impeller 2 when the environmental temperature becomes equal to or higher than the transformation temperature of the shape memory alloy. However, in the present invention, the first impeller 1 is made of a shape memory alloy. Not limited to the case where the first impeller 1 is formed, the first impeller 1 may be entirely or partially deformed by thermal expansion or the like, and may be configured to engage with the second impeller 2.

Further, in the above-described embodiment, the case where the first impeller 1 and the second impeller 2 are the impellers of the axial fan has been described. However, the present invention is not limited to the case having the axial fan. The first impeller 1 and the second impeller 2 can be centrifugal fan impellers.

Further, in the above-described embodiment, the second impeller 2 is located outside the first impeller 1, and the first impeller 1 rotates together with the second impeller 2, so that the outer shape of the axial fan is obtained. Has been described, but it is of course possible to configure not only the outer shape but also the size of the blade in the width direction.

[0030]

As described above, according to the present invention,
It is possible to provide a forced air cooler that has a simple structure and can automatically change the diversion of the cooling gas in response to a change in environmental temperature, without increasing the size of the device.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a forced air cooler according to the present invention.

FIGS. 2A and 2B are cross-sectional views taken along the line AA of FIG. 1, wherein FIG. 2A shows a case where the environmental temperature is equal to or lower than a predetermined temperature, and FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 2 (b).

FIGS. 4A and 4B are views showing a first impeller of the forced air cooler of FIG. 1, wherein FIGS. 4A and 4B are a plan view and a front view, respectively, when the environmental temperature is lower than a predetermined temperature; , (D) are a plan view and a front view, respectively, when the environmental temperature is higher than a predetermined temperature.

5A and 5B are diagrams showing a second impeller of the forced air cooler of FIG. 1, wherein FIG. 5A is a plan view and FIG. 5B is a front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st impeller 1a blade 1b support | pillar part 1c edge 1d engagement hole 2 2nd impeller 2a blade 2b support | pillar part 2c engagement hole 3 motor 4 frame 4a support shaft 5 frame 6 cable 7 connector

Claims (3)

[Claims] A first impeller that is rotated by a rotating means and deforms when an environmental temperature is equal to or higher than a predetermined temperature; and a first impeller is engaged with the first impeller by deformation of the first impeller, and The second rotating by the rotating means together with the impeller
A forced air cooler having an impeller. 2. The first impeller is formed of a shape memory alloy, and when an environmental temperature exceeds a transformation temperature of the shape memory alloy, the first impeller deforms and engages with the second impeller. The forced air cooler according to claim 1, wherein: 3. The first impeller and the second impeller are axial fan impellers, the second impeller is located outside the first impeller, and the first impeller is The forced air cooler according to claim 1 or 2, wherein the outer shape of the axial fan increases by rotating together with the second impeller.